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"Timed out while sending end of data -- message may be sent more than once" appears in the mail logs of Hosted Email Security (HES)

Updated:

26 Jan 2017

Product/Version:

Hosted Email Security 3.0

Platform:

Not Applicable N/A

Summary

You see the following error message in the mai logs of HES:

Timed out while sending end of data -- message may be sent more than once.

If the mail log contains this message, you may encounter the following:

You might receive emails from a specific domain.

You will receive many repeat emails.

Details

Public

These are compatibility issues with Postfix caused by the smtp fixup or CISCO SMTP/ESMTP inspection of old CISCO ASA version. CISCO SMTP/ESMTP inspection is very strict with RFC compliance and can cause issues when you use Exchange 2007 servers, which may not be very strict with RFC compliance.

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